I've had my Mt Vernon for 2 years and have never really seen a clinker. I have seen pieces of clinkers when I empty the ash pan but never a whole one. I burned 2 bags of AWF and I came home to a stove that wont light. Upon inspection, I find the ignitor gets hot but pellets wont catch. I let the burn pot cool and stick my hand in and pull out a clinker - 1/2 a hockey puck - that the autoclean couldn't shake free. Anyone want 3 bags of AWF...free.